Fix more URLs

Author: pquentin

rest-api-spec/src/main/resources/rest-api-spec/api/indices.delete_data_stream_options.json

@@ -1,7 +1,7 @@
 {
   "indices.delete_data_stream_options":{
     "documentation":{
-      "url":"https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html",
+      "url":"https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-delete-data-stream-options",
       "description":"Delete data stream options"
     },
     "stability": "stable",

rest-api-spec/src/main/resources/rest-api-spec/api/indices.get_data_stream_options.json

@@ -1,7 +1,7 @@
 {
   "indices.get_data_stream_options":{
     "documentation":{
-      "url":"https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html",
+      "url":"https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-get-data-stream-options",
       "description":"Get data stream options"
     },
     "stability": "stable",

rest-api-spec/src/main/resources/rest-api-spec/api/indices.put_data_stream_options.json

@@ -1,7 +1,7 @@
 {
   "indices.put_data_stream_options":{
     "documentation":{
-      "url":"https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html",
+      "url":"https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-put-data-stream-options",
       "description":"Update data stream options"
     },
     "stability": "stable",

rest-api-spec/src/main/resources/rest-api-spec/api/knn_search.json

@@ -1,7 +1,7 @@
 {
   "knn_search":{
     "documentation":{
-      "url":"https://www.elastic.co/guide/en/elasticsearch/reference/master/search-search.html",
+      "url":null,
       "description":"Performs a kNN search"
     },
     "stability":"experimental",

rest-api-spec/src/main/resources/rest-api-spec/api/ml.validate.json

@@ -1,7 +1,7 @@
 {
   "ml.validate":{
     "documentation":{
-      "url":"https://www.elastic.co/guide/en/machine-learning/current/ml-jobs.html",
+      "url":null,
       "description":"Validate an anomaly detection job"
     },
     "stability":"stable",

rest-api-spec/src/main/resources/rest-api-spec/api/ml.validate_detector.json

@@ -1,7 +1,7 @@
 {
   "ml.validate_detector":{
     "documentation":{
-      "url":"https://www.elastic.co/docs/api/doc/elasticsearch",
+      "url":null,
       "description":"Validate an anomaly detection job"
     },
     "stability":"stable",

rest-api-spec/src/main/resources/rest-api-spec/api/transform.set_upgrade_mode.json

@@ -1,8 +1,8 @@
 {
   "transform.set_upgrade_mode":{
     "documentation":{
-      "url":"https://www.elastic.co/guide/en/elasticsearch/reference/current/transform-set-upgrade-mode.html",
-      "description":"Sets a cluster wide upgrade_mode setting that prepares transform indices for an upgrade"
+      "url":"https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-transform-set-upgrade-mode",
+      "description":"Set upgrade_mode for transform indices"
     },
     "stability":"stable",
     "visibility":"public",